| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 102 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 65 |
| Stop lamp remains on when the brakes are released | 44 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 38 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 37 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 36 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 36 |
| Rear reflector missing (4.8.2 (a) (ii)) | 36 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 25 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 20 |
| Rear Position lamp not working (4.2.1 (a)) | 19 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 18 |
| Front Brake excessively binding (1.2.1 (f)) | 17 |
| Registration plate issues | 17 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 16 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 16 |
| Stop lamp not working (4.3.1 (a) (ii)) | 16 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 15 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 14 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 14 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 13 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 13 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 13 |
| Registration plate lamp issues | 12 |
| Headlamp aim not tested (4.1.2 (b)) | 12 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 12 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 11 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 11 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 11 |
| Handlebar mounting insecure (2.2.1 (a) (i)) | 10 |
| Horn not working (7.7 (a)) | 9 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 9 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 9 |
| Headlamp insecure (4.1.1 (c)) | 8 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 8 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 8 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 7 |
| Horn not working (7.7 (a) (ii)) | 6 |
| Rear Brake excessively binding (1.2.1 (f)) | 6 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 6 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 6 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 6 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 6 |
| Front Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 6 |
| Front Brake disc contaminated (1.1.14 (b)) | 5 |
| Offside Rear Direction indicator likely to become detached (4.4.1 (c) (ii)) | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 5 |
| Riders seat insecure (6.2.5 (a) (ii)) | 5 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 5 |
| All direction indicators not working (4.4.1 (a) (ii)) | 5 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 5 |
| Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 4 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 4 |
| Central Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 4 |
| Horn sound not in accordance with requirements (7.7 (c)) | 4 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 4 |
| Rear Suspension arm attachment bracket/mounting insecure (5.3.3 (a) (i)) | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Front Headlamp aim unable to be tested (4.1.2 (b)) | 4 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear Drive chain sprocket excessively loose (6.1.7 (c) (i)) | 3 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 3 |
| Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 3 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 3 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 3 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied (1.1.2 (d)) | 3 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 3 |
| Front Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 3 |
| Front Horn not working (7.7 (a)) | 3 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Nearside Rear Direction indicator likely to become detached (4.4.1 (c) (ii)) | 3 |
| Clutch lever shortened so it cannot be readily operated (6.2.7 (b)) | 3 |
| Motorcycle structure joining/attachment plate or fastening insecure (6.1.1 (b) (i)) | 3 |
| Brake performance not tested (1.2.1 (g)) | 3 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 3 |
| Rear All position lamps not working (4.2.1 (a)) | 3 |
| Front Headlamp aim projected beam image obviously incorrect kick to o/s (4.1.2 (c)) | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Central Rear Upper Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 2 |
| Rear Brake component insecure (1.1.21 (c)) | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 2 |
| Nearside Rear Suspension arm pin or bush excessively worn swing arm (5.3.4 (a) (i)) | 2 |
| Rear Wheel bearing play so excessive it is likely to break up |5.1.3 |a| |ii|| | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| Suspension component pin or bush excessively worn swinging arm (5.3.4 (a) (i)) | 2 |
| Rear Brake pedal has insufficient reserve travel |1.1.2 |a|| | 2 |
| Central Rear Position lamp not working (4.2.1 (a)) | 2 |
| Stop lamp showing white light to the rear (4.3.3 (a) (ii)) | 2 |
| Rear Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 2 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Rear Wheel spindle or securing nut(s) so insecure that wheel security or steering control is adversely affected (5.2.1 (c) (ii)) | 2 |
| Front Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 2 |
| Rear Stop lamp switch with a delay in operation |4.3.2 |a| |ii|| | 2 |
| Pillion seat insecure (6.2.6 (a) (ii)) | 2 |
| Headlamp light source and lamp not compatible (4.1.4 (c)) | 2 |
| Exhaust system insecure (6.1.2 (a)) | 2 |
| Handlebar mounting so insecure that steering is adversely affected |2.2.1 |a| |ii|| | 2 |
| Rear Wheel spindle loose (5.2.1 (c) (i)) | 2 |
| Headlamp light intensity severely reduced (4.1.4 (a)) | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Front Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Fuel cap ineffective (6.1.3 (b) (i)) | 2 |
| Front Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Nearside Rear Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 2 |
| Front Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Rear Footrest missing (6.2.12 (a)) | 2 |
| Rear Brake pedal insecure (1.1.2 (e) (i)) | 2 |
| Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 2 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 2 |
| Offside Rear Footrest missing (6.2.12 (a)) | 2 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Rear Suspension arm insecurely attached (5.3.3 (a) (i)) | 2 |
| Rear Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Rear Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Front Brake fluid contaminated (1.8 (a)) | 2 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 2 |
| Roller brake test No brake control achieves an efficiency of 30% (1.2.2 (a) (i)) | 2 |
| Rear Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 2 |
| All position lamps not working (4.2.1 (a)) | 2 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 2 |